A171055 In the sequence of prime numbers, replace all the '9' digits with '6' and vice versa.

2, 3, 5, 7, 11, 13, 17, 16, 23, 26, 31, 37, 41, 43, 47, 53, 56, 91, 97, 71, 73, 76, 83, 86, 67, 101, 103, 107, 106, 113, 127, 131, 137, 136, 146, 151, 157, 193, 197, 173, 176, 181, 161, 163, 167, 166, 211, 223, 227, 226, 233, 236, 241, 251, 257, 293

Offset: 1

Author

N. J. A. Sloane and Vincenzo Librandi, Sep 04 2010

Keywords

• nonn
• base
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Programs

Mathematica

FromDigits[IntegerDigits[#] /. {9 -> p, 6 -> q} /. {p -> 6, q -> 9}] & /@ Prime[Range[100]] (* Vincenzo Librandi, Jul 06 2012, after Harvey P. Dale in similar sequences *)

PARI

a(n)=my(v=[0,1,2,3,4,5,9,7,8,6]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ Charles R Greathouse IV, Jul 31 2013